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Old 02-25-13, 07:32 PM   #22
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Join Date: Nov 2009
Location: Northampton MA
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No. No VB on the inside. You already have one on the outside. When moisture gets into the wall, how is it going to dry out? Not only is it a code violation, it's a recipe for rot and IAQ issues.

Check out these articles:

Do I Need a Vapor Retarder? |

All About Wall Rot |

@ mikesolar, the first one describes the various classes of vapor retarders. In it there is also a link to a BSC paper on the subject.
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Chipping away on a daily basis.

You know you're an ecorenovator if anything worth insulating is worth superinsulating.
S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"

Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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